Abnormal Waveforms Examples

NOTE: The size of the waveform patterns can differ greatly, depending on the adjustment of the variable knob on the oscilloscope.

NOTE: Identification of abnormal waveforms is easier when there is a large output current (regulator is not operating). (Waveforms can be observed when the headlights are illuminated).

NOTE: Check the conditions of the generator malfunction light (illuminated/not illuminated) also, and carry out a total check.

ABNORMAL WAVEFORMS

Example 1

PROBABLE CAUSE: Open circuit in diode

Fig 1: Waveform Graph - Example 1

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Example 2

PROBABLE CAUSE: Short-circuit in diode

Fig 2: Waveform Graph - Example 2

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Example 3

PROBABLE CAUSE: Open circuit in stator coil

Fig 3: Waveform Graph - Example 3

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Example 4

PROBABLE CAUSE: Short-circuit in stator coil

Fig 4: Waveform Graph - Example 4

Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.